Answer:
The strengths of excluding other groups gave black people a stronger voice for what they wanted and not what other groups think they wanted. Black people were able to express themselves more comfortably this way. While when other groups were included, they were able to share their opinions and feel included, especially if they supported what black people were doing.
The weaknesses of excluding other groups could have made other minorities (Asian, Native American, etc.) feel as if they were not as worthy of being heard. White people may have felt a certain way about not being able to express and spread their sympathy with the black folk.
Involving everyone was an effective tactic. Even if some people were not black, it let them express their disapproval of segregation and it showed the nation that not all white people were racist and believed the nation should be split.
"They had mistreated prisoners." is the answer. If you need more help, try out searching it up of socratic.org.
appoint as many as six additional Supreme Court justices.
Canada has lot's of immigrants from all over the world. Caucasians, Arabs, Africans, Asians, ...
Probably looking for something about the power struggle that ultimately led to Stalin seizing power.
Most opponents ended up dead, but some like Trotsky managed to hold out for a long time running from one country to another to stay ahead of Stalins agents.